Fluid Permeable Structured Fibrous Web

• US 20100312208A1
• Filed: 06/03/2009
• Published: 12/09/2010
• Est. Priority Date: 06/03/2009
• Status: Abandoned Application

• Current Assignee: The Procter & Gamble Company
• Original Assignee: The Procter & Gamble Company
• Inventors: Bond, Eric Bryan, Krippner, Carola Elke Beatrice, Froehlich, Ute
• Application Number:
  US12/477,473
• Publication Number:
  US 20100312208A1
• Time in Patent Office: Days
• US Class Current: 604/366
• CPC Class Codes: A61F 13/532 inhomogeneous in the plane of the pad
• CPC Class Codes: A61F 13/5376 characterised by the performance of the layer, e.g. acquisition rate, distribution time, transfer time
• CPC Class Codes: A61F 13/538 characterised by specific fibre orientation or weave
• CPC Class Codes: A61F 2013/15406 Basis weight
• CPC Class Codes: A61F 2013/53721 with capillary means

Abstract

The present disclosure is directed to a disposable absorbent article comprising a fluid permeable structured fibrous web, the fibrous web comprising thermally stable, fibers that are thermally bonded together using heat producing a base substrate that is thermally stable. The base substrate is textured via mechanical treatment producing a structured fibrous web having an aged caliper of less than 1.5 mm, a vertical wicking height of at least 5 mm, a permeability of at least 10,000 cm²/(Pa·s) and a specific volume of at least 5 cm³/g. The structured fibrous web provides optimal fluid wicking and the fluid acquisition capabilities and is directed toward fluid management applications.

Claims

1. A disposable absorbent article comprising:

a chassis including a topsheet and a backsheet;

a substantially cellulose free absorbent core located between the topsheet and the backsheet and including first and second absorbent layers, the first absorbent layer including a first substrate and the second absorbent layer including a second substrate, the first and second absorbent layers further including superabsorbent particulate polymer material deposited on said first and second substrates and thermoplastic adhesive material covering the absorbent particulate polymer material on the respective first and second substrates, said first and second absorbent layers combined together such that at least a portion of said thermoplastic adhesive material of said first absorbent layer contacts at least a portion of the thermoplastic adhesive material of said second absorbent layer, the absorbent particulate polymer material is disposed between the first and second substrates in an absorbent particulate polymer material area, and the absorbent particulate polymer material is substantially continuously distributed across the absorbent particulate polymer material area; and

an acquisition system between the topsheet and the absorbent core, wherein the acquisition system includes a fluid permeable structured fibrous web comprising thermoplastic fibers wherein the fibrous web has an aged caliper of less than about 1.5 mm, a vertical wicking height of at least about 5 mm, a permeability of at least about 10,000 cm²/(Pa·

s), and a structured substrate specific volume of at least about 5 cm³/g.

2. The disposable absorbent article of claim 1, wherein the fibers of the structured fibrous web are thermally stable.

3. The disposable absorbent article of claim 1, wherein the fibers of the structured fibrous web are continuous, uncrimped spunbond fibers.

4. The disposable absorbent article of claim 1, wherein the fibers of the structured fibrous web are thermally point bonded.

5. The disposable absorbent article of claim 1, wherein the vertical wicking height of the structured fibrous web is at least about 20 mm.

6. The disposable absorbent article of claim 1, wherein the vertical wicking height of the structured fibrous web is at least about 50 mm.

7. The disposable absorbent article of claim 1, wherein the structured substrate specific volume of the structured fibrous web is at least about 10 cm³/g.

8. The disposable absorbent article of claim 1, wherein the structured fibrous web has an MD horizontal transport (horizontal wicking distance) of at least about 10 cm.

9. The disposable absorbent article of claim 1, wherein the structured fibrous web has a permeability of at least about 20,000 cm²/(Pa·

s).

10. The disposable absorbent article of claim 1, wherein the fibers of the structured fibrous web comprise PET.

11. The disposable absorbent article of claim 1, wherein the fibers of the structured fibrous web comprise PET and coPET.

12. The disposable absorbent article of claim 1, wherein the fibers of the structured fibrous web comprise shaped fibers.

13. The disposable absorbent article of claim 12, wherein the fibers of the structured fibrous web are multilobal.

14. The disposable absorbent article of claim 1, wherein the structured fibrous web has an aged second strike through of less than about 2 seconds.

15. The disposable absorbent article of claim 1, wherein the structured fibrous web has a rewet of less than about 3.0 g.

16. The disposable absorbent article of claim 1, wherein the structured fibrous web has a basis weight of between about 30 g/m² and about 80 g/m².

17. The disposable absorbent article of claim 1, wherein the aged caliper of the structured fibrous web is greater than about 0.5 mm.

18. The disposable absorbent article of claim 1, wherein the structured fibrous web has fiber content comprising at least about 50% thermoplastic fibers.

19. The disposable absorbent article of claim 1, wherein:

the absorbent particulate polymer material is deposited on the first and second substrates in respective patterns of land areas and junction areas between the land areas such that the absorbent particulate polymer material is discontinuously distributed on the first and second substrates; and

the first and second absorbent layers are combined together such the respective patterns of absorbent particulate polymer material are offset from one another.

20. The disposable absorbent article of claim 1, wherein the absorbent particulate polymer material area extends substantially entirely across the absorbent core.

21. The disposable absorbent article of claim 1, wherein the absorbent particulate polymer material area extends substantially entirely from front to back of the absorbent core.

22. The disposable absorbent article of claim 19, wherein the respective patterns are different.

23. The disposable absorbent article of claim 1, wherein the absorbent core consists essentially of the first and second substrates, the absorbent particulate polymer material, and the thermoplastic adhesive material.

24. The disposable absorbent article of claim 1, wherein the absorbent particulate polymer material is present in the absorbent core in an amount greater than about 80% by weight of the absorbent core.

25. The disposable absorbent article of claim 1, wherein the absorbent core has a front end and a rear end and a longitudinal axis extending from the rear end to the front end and a plurality of absorbent zones, each of the plurality of absorbent zones having absorbent particulate polymer material present in differing amounts.

26. The disposable absorbent article of claim 25, wherein there is a gradual transition in amount of absorbent particulate polymer material form one of the plurality of absorbent zones to another.